时延约束下采用SVC编码的D2D协作视频多播传输方案

为缓解基站的视频流量过载,本文针对时延敏感的实时视频业务,设计一种D2D协作视频多播传输方案。该方案采用可伸缩视频编码(Scalable Video Coding, SVC)对视频流进行编码处理,利用SVC流的分层结构特征来应对多播信道间的差异性。在SVC编码的基础上,为了改善用户观看体验及提升用户所接收的视频质量,所提出的协作式视频传输方案引入有效吞吐量这一概念,在一定时延约束下,根据信道反馈信息灵活地对不同信道上的不同SVC视频层进行码率调整。仿真结果表明,所提出的方案能够有效地减小端到端时延,有效丢失率,提高有效吞吐量。

D2D Cooperative Video Multicast Transmission Based on Delay Constraint and SVC Streaming

In order to alleviate the video traffic overload of the base station, this paper designs a D2D cooperative video multicast transmission scheme for the delay-sensitive real-time video service. The scheme uses Scalable Video Coding (SVC) to encode the video stream, and utilizes the hierarchical structure features of the SVC stream to cope with the quality differences between multicast channels. In order to improve the users’ viewing experience and improve the video quality received by the user, the proposed cooperative SVC video streaming solution introduces the concept of goodput. Under certain delay constraints, the rate adjustment of different SVC video layers on different channels is flexibly adjusted according to channel feedback information. Compared with other schemes, the simulation results show that the proposed scheme can effectively reduce end-to-end delay, effective loss rate and improve goodput.